Telegraph-repeater.



J. M. FELL.

TELEGRAPH ,REPEATER. APPLICATION FILED AUG-25. me.

1,238,09. Patented Aug. 21,1917.

A Hynr'ri STATES PATET FFIQE JOHN M. FELL, 0F HACKENSACK, NEW JERSEY, ASSIGNOR TO AMERICAN TELEPHONE .A1 TD TELEGRAPH COMPANY, A CORPORATION OF NEW YORK.

TELEGRAPH-BEPEATER.

reasons).

'1 '0 all whom it may concern:

Be it known that LJOI-IN M. FELL, residing at Hackensack, in the county of Bergen and State of New Jersey, have inventedcertain Improvements in Telegraph-Repeaters,

into branch or substation lines. The inven tion is chiefly directed to the provision ofan organization whereby in a directpoint repeater, or one in f which apparatus of one section transmits signaling impulsesto the adjacent section without other interposed active apparatus, a branch line may be operated over a slngle circuit with the substation equipment 111 accordance with ordinary 2o Morse practice.

The drawing illustrates diagrammatically one embodiment of the invention.

The reference characters L and L" designate line sections connected to one another through a central station A by repeating apparatus, whlch also serves to operatlvely associate with the main line sections a branch line L extending to a substation A The connecting apparatus is in the form of a half duplex repeater. For the main line sections L and L there are primary receiving electro -mechanisms consisting of polarized" relays R and R, res ectively, each of which has its windings connected differently in the real line and the corresponding artificial line-Z or Z inthe usual manner, while the armatures of the relays R, R move between opposite contracts to which are joined the) negative and positive central station batteries B and B U The armatures of relays R, R are connected to the windings of second ary receiving electro-mechanisms, which may be furnishedby the polarized repeating sounders S and S, respectively, and are also connected tothe front contacts oftrans miu ting electro mechanisms consisting of the pole changers T respectively of the dupleX set The armaturesof the pole'change ers are joinedthroughthe common conductors of the duplex to the respective main line sections with their associated artificial lines.

At the central station there is a connection in series from batteryB through an attendants key K, winding of the pole changer T @115 one main line section, a like key K the Specification of LetterslPatent.

Patented A110. 21, i917.

Application filed. August 25, 1916. Serial No. 116,849.

winding of the pole changer T of the other line section and normal contacts of. sound back contacts each furnishes a lockinggroundconnection for the pole changers of both line sections, they thus controlling the I energizatiorr thereof.

In considering the operation of the system, let it'be assumed that signaling impulses are'being transmitted from the distant station over line L. Normally or with the pole-changing keys at each side of the repeating station closed on negative battery,

there is no current in the line sections, while I at the repeating station A current flows from the. positive terminals of the batteries B by way of ground through the artificial lines,'lower windings of the polarized relays, common conductors, front contacts of the pole changers, conductors 13 and 17 and armatures and normal contacts of the polarized relays to battery. The flow in the windings of the polarized relays is in such direction as to retain their'armatures upon the normal contacts. When the pole-changing key of the distant transmitting station of line L is reversed,current from positive battery thereat passes over theline through the upperwinding of relay R at station A, then divides, a small part going to ground through the lower winding of relay R and the artificial line Z, while the larger part finds it way to ground through common conductor 10,- inductance 11, contact 12 of pole changer T conductor 13 and in parallel through contact 14 'of relayR, resistance 15. and battery B and resistance 16 andthe winding'of sounder S. At the same time thereis a divided fiow of current from nega tive battery B at station Ato ground, a portion going through the resistance 16 and winding of sounder S. The other portion passes through conductor 13, contact 12 of pole changerT, common conductor 10 and inductance 11 and divides equally between the line L and artificial line Z, both windings of relay B being included in these paths.

The resultant effect of all these currents is .paratus of the distant station in line such that relay B only is operatedand opens its normal contact, closing the contact to positivebattery B: Thus as the distant key is oscillated, impulses of-positive and negative current are appliedto the armature of relay R from central station batteries B- and- B. These find their way through conductor 17, contact l8flof'pole' changer T", com-- mon conductor 19, inductance 20, and ins parallel through line L and artificial line Z, these including the windings of thedifferential relay It. To, current so applied relay It does-not. respond, but the signals:

produce their effect upon the, receiving- The impulses from theaigmature of relay B, have as well a: path through resistance, 2L nd: th win ngl 0 E ep a ing sQ d r S- his s operat and openi g, nd: l ing} ntac 2 z ak a d c mplet e' lat ity of substation. line L the circuit from, battery BF. includingllgey, K, windingofpele hang r-" k y Kf ',.W di o p le cha ge T, normal contact 23 ofy sounder Sflcon;

'ductor 2 4, contact22 ofsounden S, substationI line L receivin a. aratus 2! and 7. b V 1 I transmitting apparatus K Consequently the apparatus R? alsoproduces the transmitted signals. madebefo-re contact 22 opensand joins conductor 24 through'resistance. 27 to ground, thi completing a locking circuit for both the pole changers T T which, serves to hold them energized to prevent; mutilation v ofthe. signals which are; being repeated,

when the normal energizing circuit of the pole. changers over the line L is opened at I contact 25. In the same manner transmission may occur from line L", the signals be.- ing repeated into, line L at contact '23 of sounder S and the locking connection for the pole changers being through contact 28 a of sounder S".

deem the operator at actuates the key K he-efliects simultaneous transmission into, both line sect ons, (lonsiderlngtransmis-v sionover line L as representing either, the

breaking of line and the consequent deenergization of pole changer T (together ferential character of thewindings of the latter, Negative current isfurnished at contactl8 of the pole changer T by Way of.

conductor 17 and; the normal contact of re lay R. Thi$;'COIltI'Ol of the pole changers. also. gives tl ie operator at substation A the powerof arresting transmissionin either direction over the main line by opening his ey t r e se th jp 'l cha rs and hus.

Contact 25' of sounder S is,

contacts ofthe line relays and normal contacts of the. pole changers, with the conse quent freedom from distortion of signals which results when they mustact upon a chainof apparatus and also, that the substation line, while receiving signals from both main, line sections and being adapted, to transmit to, said, sections, may be operated over a, single. conductor and in, ZLCOIfClELIl CG with the, usual Morse methods I. claim as my invention:

L. Ina telegraphrepeating system, the

combination with a main line divided into sections, ottransmitting. and receiving apparatus. for each, section, and means under the influence of each of the receiving apparatus for controlling the transmitting apparatus of, said sectiens and thereby normally closing, a hreakineach sectien of the main line.

Q -In, a, telegraph repeating system, the combination with a mainline divided into sectiens, of transmitting and receiving apparatus for each section, and means under the influence of the receiving apparatus for locking the transmitting apparatus of, said sections a a n t ope t n,

' 3. In a telegraph repeating, system, the combination with a main line divided into sections, 0t transmitting and receiving electro-mechanisms for each section, a circuit for the. windings of said, transmitting electrogmechanisms and braneh locking circuits therefor controlledby a, receiving. electromechanism each controlling both transittina. qtme hel i mac v 4, 111 a telegraph repeating system, the, combination with, a main, line. divided into sections of transmitting and receiving electro mechanisms for. each section, a circuit for the windings of said transmitting electro mechanisms controlled the contacts of both receiving electro-mechanisms and a reach a k ngir u t on t d by a ee insm heei m 1 1 t ol i g each. f said transmitting eiectro mechanisms, v

5. a telegraph repeating system, the combination with a main line dividedinto e t ons o t an m tin a re 'e e lectro-mechanisnis for each section, direct connections between active contacts of the receiving electro-mechanism of one section and the normal contacts of the transmitting electtro-meehanisin of another section for repeating trom one section into another, a branch line including in series th e, windings b t a ra s ait ns d fie -me a i s 6, a telegraphzrepeating system, the omb nat ea wit a ma n in divided int sections, of transmitting and receiving electro-mechanisms For each section, direct con nections between active contacts of the re ceiving electro-mechanism of one section and normal contacts of the transmitting electromechanism of another section for repeating from one section into another, and a branch line including in series contacts of both receiring electro-1ncchanisms.

7. In a telegraph repeating system, the combination with a main line divided into sectlons, of transmitt ng and receiving electroanechanisms for each section, direct conand a primary receiving electro-mechanism for each section, direct connections between active contacts of the receiving electromechanism of one section and normal contacts oi the transmitting electro-mechanism at another section for repeating from one section into the other, a secondary receiving electroanechanism under the control of each prin'iary electr c-1mechanism, and a branch line including in series contacts of both secondary electro-mechanisms.

9. In a telegraph repeating system, a main line, a central station at which the main line is divided into sections, transmitting and receiving apparatus for each line section at the cent Till station, a central station battery, connections at the central station for battery through the transmitting and receiving apparatus of both line sections, a substation, and a line joining the substation to said central station connections.

10. In telegraph repeating system, a main line, a central station at which the main line is divided into sections, transmit ting and receiving electroanechanisms for each line section at the central station, a central station battery, connections at the central station for battery through the windings of the transmitting electro-mechanisms and contacts of the receiving electro-mechanisins of both line sections in series, a substation, and a line joining the substation to said central station connections,

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses, this 21st day of August 1916.

JOHN, M. FELL.

Witnesses RALPH E. PIERCE, B. PERRY HAMILTON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

